Audio Spectrum effect on a half-circle path

Greetings folks! I have a bit of a question that I thought would be easy, but apparently is a bit trickier than I realised.

I'd like to render the wave-form of a song in a composition in AE. It's simple enough to add a complete circle path, add the Audio Spectrum effect, and then set it to use the circle. However, I'd like to position the circle half off-screen (Along the bottom), and have all of the audio spectrum visible on just the half that's visible.

I thought it would be as easy as deleting the points of the mask in order to make a non-closed path that fits the shape I want, however it seems that with the default settings, Audio Spectrum won't work on non-closed paths.

Has anyone managed to solve this with Audio Spectrum before? If not, is there maybe a more advanced third party plugin I could potentially look into?

Thanks so much!